rtpengine/lib/mix_in_x64_sse2.S

#if defined(__linux__) && defined(__ELF__)
.section	.note.GNU-stack,"",%progbits
#endif

#if defined(__x86_64__)

.global s16_mix_in_sse2

.text

# 16 bits in 128 bits = 8 samples at a time
s16_mix_in_sse2:
	mov %rdx, %rax
	and $-8, %al			# 8 samples at a time
	xor %rcx, %rcx
loop:
	cmp %rax, %rcx
	jge remainder
	movdqu (%rdi,%rcx,2), %xmm0	# 16-bit size
	movdqu (%rsi,%rcx,2), %xmm1	# 16-bit size
	paddsw %xmm0, %xmm1
	movdqu %xmm1, (%rdi,%rcx,2)	# 16-bit size
	add $8, %rcx			# 8 samples at a time
	jmp loop
remainder:
	xor %r8, %r8
	xor %r9, %r9
	cmp %rdx, %rcx
	jge done
	mov (%rsi,%rcx,2), %r8w		# 16-bit size
	mov (%rdi,%rcx,2), %r9w		# 16-bit size
	movd %r8, %xmm0
	movd %r9, %xmm1
	paddsw %xmm0, %xmm1
	movd %xmm1, %r8
	mov %r8w, (%rdi,%rcx,2)		# 16-bit size
	inc %rcx
	jmp remainder
done:
	ret

#endif